FreeTDS Development Group

[Konrad J Hambrick <konrad AT jax01.payplus.com>]

Paul --

Is /lib/libc.so.6 on your machine different
than the version on your colleague's machine ?

HTH.

-- kjh


On 10/26/2007 05:56 AM, Paul Andrews wrote:

> For chuckles, I commented out the fopen section in locale.c.
>
> I was then able to get past dbinit()
>
> HOWEVER, on dblogin(), I get a segmentation fault on:
>
> DSTR
> tds_dstr_copy(DSTR * s, const char *src)
> {
> if (*s != (DSTR) &tds_str_empty)
> free(*s);
> if (!src[0])
> *s = (DSTR) &tds_str_empty;
> else
> *s = (DSTR) strdup(src); <-- This line cause SIGSEGV when setting DB-Library
> return *s;
> }
>
> Frame Stack:
> #0 ??
> #1 strdup /lib/libc.so.6
> #2 tds_dstr_copy tdsstring.h:131
> #3 tds_set_library login.c:132
> #4 dblogin dblib.c:402
>
> How come the unittests passed and this code fails bearing in mind that
> the code runs unaltered on a colleague's machine?
>
> Paul.
>
> Paul Andrews wrote:
> > OK...I removed the rpm-installed FreeTDS, downloaded 0.64 and installed.
> >
> > I ran 'make check' and all tests were *fine.*
> >
> > I opened up my project and ran it...same result...segmentation fault on
> > dbinit()!
> >
> > Frame Stack:
> >
> > #0 ??
> > #1 ?? /lib/libc.so.6
> > #2 fopen64 /lib/libc.so.6
> > #3 tds_get_locale locale.c:66
> > #4 tds_alloc_context memc:539
> > #5 dblib_get_tds_ctx dblib.c:263
> > #6 dbinit dblib.c:375
> > #7 db_connect /projects/lpgsonic/src/db.c:25
> >
> > My machine:
> > ldd:
> > linux-12:/projects/lpgsonic/debug/src # ldd lpgsonic
> > linux-gate.so.1 => (0xffffe000)
> > libm.so.6 => /lib/libm.so.6 (0xb7f95000)
> > libsybdb.so.5 => /usr/local/lib/libsybdb.so.5 (0xb7f49000)
> > libc.so.6 => /lib/libc.so.6 (0xb7e16000)
> > /lib/ld-linux.so.2 (0xb7fd8000)
> >
> > Colleague:
> > /projects/lpgsonic/debug/src # ldd lpgsonic
> > linux-gate.so.1 => (0xffffe000)
> > libm.so.6 => /lib/libm.so.6 (0xb7f56000)
> > libsybdb.so.5 => /usr/local/lib/libsybdb.so.5 (0xb7f14000)
> > libc.so.6 => /lib/libc.so.6 (0xb7df4000)
> > /lib/ld-linux.so.2 (0xb7f9a000)
> >
> > James K. Lowden wrote:
> >   
> > > Paul Andrews wrote:
> > >   
> > >     
> > > >     I can confirm that
> > > >         1. dbinit is only called once.
> > > >         2. fopen causes a segmentation fault
> > > >     
> > > >       
> > > Hi Paul, 
> > >
> > > I'm starting to think this is an ABI problem.  
> > >
> > >   
> > >     
> > > > I sent the entire project over to a colleague who successfully debugged
> > > > and ran the program on his 10.2 installation.
> > > >     
> > > >       
> > > Good.  That supports the notion that your code *and* FreeTDS are OK.  
> > >
> > >   
> > >     
> > > >     I then decided to update to Suse 10.3 (complete format and new
> > > > installation).
> > > >
> > > >     Problem is still there.
> > > >     
> > > >       
> > > ...
> > >   
> > >     
> > > >      I have glibc 2.6.1-18.3, he has glibc 2.4-31.1
> > > >     
> > > >       
> > > ...
> > >   
> > >     
> > > > Platform: Suse 10.2 / 10.3 using rpm's from OpenSuse.org
> > > >     
> > > >       
> > > Did you build FreeTDS from source on the 10.3 box?  If you're using
> > > binaries compiled for another glibc, that could conceivably explain a
> > > fault in fopen(3). In that case, though, it's the shared objects you'd be
> > > interested in.  Try ldd(1) on both system to see what your program is
> > > using.  
> > >
> > > See also the gnu libc faq:
> > > http://www.gnu.org/software/libc/FAQ.html#s-1.17, 
> > >
> > > The standard remedy to broken binaries is to build good ones.  Then do
> > > "make check" and watch everything work.  ;-)
> > >
> > > (You might try having your friend compile your test program and running it
> > > on your machine.  But that could only prove a negative; if it worked, it
> > > wouldn't tell us much.)
> > >
> > > If you built from scratch on your machine and get a failure in the first
> > > unit test in fopen(3), I would be interested in seeing the backtrace.  I
> > > don't know what I could do about it, but it would be interesting!  
> > >
> > > HTH.  
> > >
> > > --jkl
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